# Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import paddle

from paddlepanseg.cvlibs import manager


@manager.LOSSES.add_component
class NoncustomizableLoss(paddle.nn.Layer):
    def __init__(self, ignore_index=255):
        super().__init__()
        # `ignore_index` unused

    def forward(self, logits, labels):
        # `logits` and `labels` unused
        raise RuntimeError(
            "A `NoncustomizableLoss` object should not be called.")
